@book{390180,
	author = {BAYLEY, David H. and NIXON, Christine},
	title = {The changing environment for policing, 1985-2008},
	publisher = {Harvard Kennedy School ; National Institute of Justice},
	year = {2010},
	series = {New Perspectives In Policing. NCJ 230576},
	address = {Cambridge, MA ; Washington, DC},
	note = {Ficheiro de 442 Kb em formato pdf (16 p.). Também disponível em: https://www.ncjrs.gov/pdffiles1/nij/ncj230576.pdf.Acedido em 05 de Abril de 2011.}
}